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Investment Securities (Investment gains (losses) for Level 3) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Unrealized gains (losses) on investments | $ 76.4 | $ 26.1 | $ 48.4 | $ 82.1
Other long-term investments |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Unrealized gains (losses) on investments | 20.1 | (2.5) | 20.5 | 9.2
Level 3 Inputs |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Unrealized gains (losses) on investments | 4.0 | (0.7) | 2.1 | (2.2)
Level 3 Inputs | Other long-term investments |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Unrealized gains (losses) on investments | $ 4.0 | $ (0.7) | $ 2.1 | $ (2.2)

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